I ran into problems much like this while developing AgriMaps (http://www.agrimaps.com). In particular, one problem was to be able to edit common attributes on a group of fields as though they were one record. We also created a perimeter outline to show the user which fields were being affected.
We keep the Fields polygons as separated entities. When I need a perimeter for a group (whether contiguous or not) I combine copies of the fields into a single polygon. I use copies so I don't destroy the original Fields polygons, and the resulting perimeter becomes a record in a separate layer. The "turn rows" areas should already be marked as non-field, and you don't include these in the combine. It's easier to do this with Mapbasic, but the operations can all be done in MapInfo. So the relevant operations are: 1. Copy desired Field polygons to the cosmetic layer (or any other real layer you want to hold field group perimeters), and make that layer editable. 2. Select the desired polygons in the new layer, leaving out turn rows, non-crop and any other areas you wish, and use Objects/Combine to make a single entity out of them. Change the brush style to "None" and set the border pen to something that stands out. Now you will be able to see your fields through the perimeters of this new layer. 3. If your turn rows areas need to be removed from the fields first, you can use Objects/Split, or Objects/Erase (see the Set Target command too.) -- - Bill Thoen ------------------------------------------------------------ GISnet, 1401 Walnut St., Suite C, Boulder, CO 80302 tel: 303-786-9961, fax: 303-443-4856 mailto:[EMAIL PROTECTED], http://www.gisnet.com/ ------------------------------------------------------------ "Cal W. Crawford" wrote: > > We use GPS to create polygons of all cotton fields in the state of MS to comprise >our database. There are a number of fields with the same field number that we have >to combine into one field for our database purposes. There are turn rows mapped out >of the fields (inside the group of fields) that have to be removed upon combining of >the fields. I need to combine all fields together and create one common field >boundary for the perimeter of all of the like field numbers (that follows the contour >of the outer most fields). Is there a function in MapInfo Pro 7.0 that will do this >for me, so that we do not have to reshape the fields or trace around them with the >polygon tool? Thanks. > > Cal W. Crawford > GPS/GIS Coordinator > MS Boll Weevil Mgmt. Corp. > Bost Extension Center, Suite 313 > Box 9776 > MS State Univ., MS 39762 > 662-325-0838 > 662-325-3531 (fax) --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 4261
